package Pre.SetDemo;

import java.util.HashSet;
import java.util.Objects;

public class Study {
    public static void main(String[] args) {
        HashSet hashSet = new HashSet();
        hashSet.add("zcj");
        hashSet.add("wsx");
        hashSet.remove("zcj");
        System.out.println(hashSet);
        System.out.println(hashSet.size());
    }
}
